<?php
require_once __DIR__ . '/../db/config.php';

class WablasService {
    public static function sendMessage($to, $message) {
        $pdo = db();
        $settings = $pdo->query("SELECT setting_key, setting_value FROM settings WHERE setting_key LIKE 'wablas_%'")->fetchAll(PDO::FETCH_KEY_PAIR);
        
        $token = $settings['wablas_api_token'] ?? '';
        $serverUrl = $settings['wablas_server_url'] ?? '';
        $securityKey = $settings['wablas_security_key'] ?? '';

        if (empty($token) || empty($serverUrl)) {
            error_log("Wablas settings missing.");
            return ['success' => false, 'error' => 'Settings missing'];
        }

        $to = prefix_phone($to);
        
        $data = ['phone' => $to, 'message' => $message];
        if (!empty($securityKey)) {
            $data['security_key'] = $securityKey;
            $data['secret_key'] = $securityKey;
        }

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_HTTPHEADER, ["Authorization: $token"]);
        curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($data));
        curl_setopt($curl, CURLOPT_URL, rtrim($serverUrl, '/') . "/api/send-message");
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
        
        $result = curl_exec($curl);
        $error = curl_error($curl);
        curl_close($curl);

        if ($error) {
            error_log("Wablas CURL error: " . $error);
            return ['success' => false, 'error' => $error];
        }

        $response = json_decode($result, true);
        if (isset($response['status']) && $response['status'] == true) {
            return ['success' => true, 'data' => $response];
        }

        error_log("Wablas API error: " . $result);
        return ['success' => false, 'error' => $result];
    }

    public static function getOrgName($lang = 'en') {
        $pdo = db();
        $org = $pdo->query("SELECT name_en, name_ar FROM org_profile LIMIT 1")->fetch();
        return ($lang === 'ar') ? ($org['name_ar'] ?? 'المنظمة') : ($org['name_en'] ?? 'Organization');
    }

    private static function sendTemplatedMessage($to, $templateName, $vars, $lang = 'en') {
        if (empty($to)) {
            return ['success' => false, 'error' => 'Recipient phone number is missing.'];
        }

        $pdo = db();
        $stmt = $pdo->prepare("SELECT * FROM whatsapp_templates WHERE template_name = ? AND status = 1");
        $stmt->execute([$templateName]);
        $template = $stmt->fetch();

        if (!$template) {
            error_log("WhatsApp template '$templateName' not found or is disabled.");
            return ['success' => false, 'error' => "Template '$templateName' not found or disabled."];
        }

        $messageBody = ($lang === 'ar' && !empty($template['template_body_ar'])) ? $template['template_body_ar'] : $template['template_body_en'];

        foreach ($vars as $key => $value) {
            $messageBody = str_replace('{'.$key.'}', $value, $messageBody);
        }

        return self::sendMessage($to, $messageBody);
    }

    public static function sendThankYou($donation, $lang = 'en') {
        $pdo = db();
        $stmt = $pdo->prepare("SELECT title_en, title_ar FROM cases WHERE id = ?");
        $stmt->execute([$donation['case_id']]);
        $case = $stmt->fetch();
        $caseTitle = ($lang === 'ar' && !empty($case['title_ar'])) ? $case['title_ar'] : $case['title_en'];

        $vars = [
            'donor_name' => !empty($donation['donor_name']) ? $donation['donor_name'] : (($lang === 'ar') ? 'فاعل خير' : 'Anonymous'),
            'amount' => number_format($donation['amount'], 3),
            'case_title' => $caseTitle,
            'org_name' => self::getOrgName($lang)
        ];

        return self::sendTemplatedMessage($donation['donor_phone'], 'donation_thank_you', $vars, $lang);
    }

    public static function sendGiftNotification($donation, $lang = 'en') {
        if (empty($donation['is_gift'])) {
            return ['success' => false, 'error' => 'Not a gift'];
        }
        
        $pdo = db();
        $stmt = $pdo->prepare("SELECT title_en, title_ar FROM cases WHERE id = ?");
        $stmt->execute([$donation['case_id']]);
        $case = $stmt->fetch();
        $caseTitle = ($lang === 'ar' && !empty($case['title_ar'])) ? $case['title_ar'] : $case['title_en'];

        $vars = [
            'recipient_name' => !empty($donation['gift_recipient_name']) ? $donation['gift_recipient_name'] : (($lang === 'ar') ? 'صديق' : 'Friend'),
            'donor_name' => !empty($donation['donor_name']) ? $donation['donor_name'] : (($lang === 'ar') ? 'فاعل خير' : 'A generous donor'),
            'case_title' => $caseTitle,
            'gift_message' => !empty($donation['gift_message']) ? "\n\n" . (($lang === 'ar') ? 'رسالة:' : 'Message:') . " \"" . $donation['gift_message'] . "\"" : "",
            'org_name' => self::getOrgName($lang)
        ];
        
        return self::sendTemplatedMessage($donation['gift_recipient_phone'], 'donation_gift_notification', $vars, $lang);
    }

    public static function sendCaseDonationNotification($donation, $lang = 'en') {
        $pdo = db();
        $stmt = $pdo->prepare("SELECT c.title_en, c.title_ar, c.contact_phone FROM cases c WHERE c.id = ?");
        $stmt->execute([$donation['case_id']]);
        $case = $stmt->fetch();

        if (!$case || empty($case['contact_phone'])) {
            return ['success' => false, 'error' => 'Case contact phone not found'];
        }

        $caseTitle = ($lang === 'ar' && !empty($case['title_ar'])) ? $case['title_ar'] : $case['title_en'];

        $vars = [
            'amount' => number_format($donation['amount'], 3),
            'case_title' => $caseTitle,
            'donor_name' => !empty($donation['donor_name']) ? $donation['donor_name'] : (($lang === 'ar') ? 'فاعل خير' : 'Anonymous'),
            'org_name' => self::getOrgName($lang)
        ];

        return self::sendTemplatedMessage($case['contact_phone'], 'case_donation_notification', $vars, $lang);
    }
}